States › Pennsylvania › Dauphin County

Dauphin County, PA Water Quality

Water quality data for 17 public water systems serving Dauphin County, Pennsylvania — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 17 water systems · 37 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Dauphin County Earns a B

Dauphin County: 37 communities across 17 water systems. 100.0% have no open violations.

  • Median lead where detected: 3.00 ppb
  • 32 communities with a lead detection, 5 reporting none detected
  • 3 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 100.0% of communities have no open violations
3 ppb
Median Lead Level
County-wide, 90th percentile
17
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Jackson
    4.00 ppb
    No federal limits exceeded on record
    B
  • Harrisburg
    Not detected
    No federal limits exceeded on record
    A
  • Lower Paxton
    2.10 ppb
    No federal limits exceeded on record
    A
  • Swatara
    2.10 ppb
    No federal limits exceeded on record
    A
  • Derry
    3.00 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Reed
    301.00 ppb
    Lead above the 15 ppb action level
    F
  • Gratz
    67.90 ppb
    Lead above the 15 ppb action level
    C
  • Lykens
    7.85 ppb
    Copper above the 1,300 ppb action level
    C
  • Lykens
    13.60 ppb
    Copper above the 1,300 ppb action level
    C
  • Wiconisco
    13.60 ppb
    Copper above the 1,300 ppb action level
    C
County Lead Level — Median 3 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 3 ppb — 20% of the federal action level
Systems by Lead Level
Under 5 ppb
20
5 – 10 ppb
2
10 – 15 ppb
10
No Data
5

All Cities in Dauphin County

Harrisburg Not detected A
Lower Paxton 2.10 ppb A
Swatara 2.10 ppb A
Derry 3.00 ppb A
Susquehanna 2.10 ppb A
Middletown 3.00 ppb C
Lower Swatara 2.10 ppb A
West Hanover 3.00 ppb A
Progress Not detected A
Steelton 1.70 ppb B
South Hanover 3.00 ppb A
Hummelstown 2.10 ppb A
Highspire 2.10 ppb A
Upper Paxton Not detected C
Lykens 13.60 ppb C
Penbrook Not detected A
Paxtang 2.10 ppb A
Elizabethville 4.00 ppb B
Millersburg Not detected C
Halifax 0.50 ppb B
Williamstown 32.00 ppb C
Royalton 24.00 ppb C
Washington 4.00 ppb B
Conewago 3.00 ppb A
Wiconisco 13.60 ppb C
Halifax 0.50 ppb B
Dauphin 2.10 ppb A
Williams 32.00 ppb C
Gratz 67.90 ppb C
Middle Paxton 2.10 ppb A
East Hanover 24.00 ppb C
Londonderry 5.20 ppb B
Pillow 28.00 ppb C
Lykens 7.85 ppb C
Reed 301.00 ppb F
Mifflin 28.00 ppb C
Jackson 4.00 ppb B
Showing 37 cities
No active violations Active violations

About Dauphin County Drinking Water

Dauphin County is served by 17 water systems covering 37 communities. No community here has an open violation on record.

Of the communities reporting lead results, 32 recorded a detection, with a median of 3.00 ppb — 20% of the federal action level. 5 reported none detected, which means below the laboratory limit rather than an absence of lead.

3 of 37 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 2 of them.

Frequently Asked Questions

Is Dauphin County tap water safe to drink?▼
No community in Dauphin County has an open violation on record. 3 of 37 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Dauphin County?▼
Among communities with a detection the median is 3.00 ppb, 20% of the 15 ppb action level. 5 reported none detected and 0 reported no result.
How many water systems serve Dauphin County?▼
17 community water systems serve 37 communities here.
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